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If |veca|=2 and |vecb|=3 and veca.vecb=0...

If `|veca|=2 and |vecb|=3 and veca.vecb=0, " then "| (vecaxx(vecaxx(vecaxx(vecaxxvecb))))|`

A

`48 hatb`

B

`-48 hatb`

C

`48 hata`

D

`-48 hata`

Text Solution

Verified by Experts

The correct Answer is:
a
`(vecaxx (veca xx (veca xx (vecaxx vecb ))))`
` = (vecaxx (veca xx ((veca .vecb)veca -(veca .vecb)vecb)))`
`(veca xx (veca xx (-4vecb)))`
` -4 (veca xx (veca xx vecb))`
` -4 ((veca xx vecb) veca - (veca.veca)vecb)`
` -4 (-4vecb) = 16 vecb = 48 vecb`
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CENGAGE PUBLICATION-DIFFERENT PRODUCTS OF VECTORS AND THEIR GEOMETRICAL APPLICATIONS -Exercises MCQ
  1. The three vectors hat i+hat j,hat j+hat k, hat k+hat i taken two at a ...

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  2. If vec d= vec axx vec b+ vec bxx vec c+ vec cxx vec a is non-zero vec...

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  3. If |veca|=2 and |vecb|=3 and veca.vecb=0, " then "| (vecaxx(vecaxx(vec...

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  4. If the two diagonals of one its faces are 6 hat i+6 hat ka n d4 hat ...

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  5. The volume of a tetrahedron formed by the coterminous edges vec a ...

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  6. If vec a , vec b , and vec c are three mutually orthogonal unit vector...

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  7. Vector vec c is perpendicular to vectors vec a=(2,-3,1)a n d vec b...

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  8. Given veca=xhati+yhatj+2hatk,vecb=hati-hatj+hatk , vecc=hati+2hatj, ve...

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  9. Let veca=a(1)hati+a(2)hatj+a(3)hatk,vecb=b(1)hati+b(2)hatj+b(3)hatk an...

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  10. Let vecr, veca, vecb and vecc be four non-zero vectors such that vecr....

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  11. If veca, vecb and vecc are such that [veca \ vecb \ vecc] =1, vecc= la...

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  12. If 4 vec a+5 vec b+9 vec c=0, then ( vec axx vec b)xx[( vec bxx vec c)...

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  13. Value of [ vec axx vec b , vec axx vec c , vec d] is always equal to...

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  14. Let vec aa n d vec b be mutually perpendicular unit vectors. Then ...

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  15. Let vec aa n d vec b be unit vectors that are perpendicular to each ...

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  16. veca and vecb are two vectors such that |veca|=1 ,|vecb|=4 and veca. v...

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  17. If vecb and vecc are unit vectors, then for any arbitary vector veca,...

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  18. If veca .vecb =beta and veca xx vecb = vecc ," then " vecb is

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  19. If a( vecalphaxx vecbeta)+b( vecbetaxx vecgamma)+c( vecgammaxx vecalph...

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  20. If ( vec axx vec b)xx( vec bxx vec c)= vec b ,w h e r e vec a , vec b ...

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